diff options
Diffstat (limited to 'drivers/ieee1394/sbp2.c')
| -rw-r--r-- | drivers/ieee1394/sbp2.c | 2141 |
1 files changed, 2141 insertions, 0 deletions
diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c new file mode 100644 index 0000000..a01b43e --- /dev/null +++ b/drivers/ieee1394/sbp2.c @@ -0,0 +1,2141 @@ +/* + * sbp2.c - SBP-2 protocol driver for IEEE-1394 + * + * Copyright (C) 2000 James Goodwin, Filanet Corporation (www.filanet.com) + * jamesg@filanet.com (JSG) + * + * Copyright (C) 2003 Ben Collins <bcollins@debian.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +/* + * Brief Description: + * + * This driver implements the Serial Bus Protocol 2 (SBP-2) over IEEE-1394 + * under Linux. The SBP-2 driver is implemented as an IEEE-1394 high-level + * driver. It also registers as a SCSI lower-level driver in order to accept + * SCSI commands for transport using SBP-2. + * + * You may access any attached SBP-2 (usually storage devices) as regular + * SCSI devices. E.g. mount /dev/sda1, fdisk, mkfs, etc.. + * + * See http://www.t10.org/drafts.htm#sbp2 for the final draft of the SBP-2 + * specification and for where to purchase the official standard. + * + * TODO: + * - look into possible improvements of the SCSI error handlers + * - handle Unit_Characteristics.mgt_ORB_timeout and .ORB_size + * - handle Logical_Unit_Number.ordered + * - handle src == 1 in status blocks + * - reimplement the DMA mapping in absence of physical DMA so that + * bus_to_virt is no longer required + * - debug the handling of absent physical DMA + * - replace CONFIG_IEEE1394_SBP2_PHYS_DMA by automatic detection + * (this is easy but depends on the previous two TODO items) + * - make the parameter serialize_io configurable per device + * - move all requests to fetch agent registers into non-atomic context, + * replace all usages of sbp2util_node_write_no_wait by true transactions + * Grep for inline FIXME comments below. + */ + +#include <linux/blkdev.h> +#include <linux/compiler.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/gfp.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stat.h> +#include <linux/string.h> +#include <linux/stringify.h> +#include <linux/types.h> +#include <linux/wait.h> +#include <linux/workqueue.h> +#include <linux/scatterlist.h> + +#include <asm/byteorder.h> +#include <asm/errno.h> +#include <asm/param.h> +#include <asm/system.h> +#include <asm/types.h> + +#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA +#include <asm/io.h> /* for bus_to_virt */ +#endif + +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_dbg.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> + +#include "csr1212.h" +#include "highlevel.h" +#include "hosts.h" +#include "ieee1394.h" +#include "ieee1394_core.h" +#include "ieee1394_hotplug.h" +#include "ieee1394_transactions.h" +#include "ieee1394_types.h" +#include "nodemgr.h" +#include "sbp2.h" + +/* + * Module load parameter definitions + */ + +/* + * Change max_speed on module load if you have a bad IEEE-1394 + * controller that has trouble running 2KB packets at 400mb. + * + * NOTE: On certain OHCI parts I have seen short packets on async transmit + * (probably due to PCI latency/throughput issues with the part). You can + * bump down the speed if you are running into problems. + */ +static int sbp2_max_speed = IEEE1394_SPEED_MAX; +module_param_named(max_speed, sbp2_max_speed, int, 0644); +MODULE_PARM_DESC(max_speed, "Force max speed " + "(3 = 800Mb/s, 2 = 400Mb/s, 1 = 200Mb/s, 0 = 100Mb/s)"); + +/* + * Set serialize_io to 0 or N to use dynamically appended lists of command ORBs. + * This is and always has been buggy in multiple subtle ways. See above TODOs. + */ +static int sbp2_serialize_io = 1; +module_param_named(serialize_io, sbp2_serialize_io, bool, 0444); +MODULE_PARM_DESC(serialize_io, "Serialize requests coming from SCSI drivers " + "(default = Y, faster but buggy = N)"); + +/* + * Adjust max_sectors if you'd like to influence how many sectors each SCSI + * command can transfer at most. Please note that some older SBP-2 bridge + * chips are broken for transfers greater or equal to 128KB, therefore + * max_sectors used to be a safe 255 sectors for many years. We now have a + * default of 0 here which means that we let the SCSI stack choose a limit. + * + * The SBP2_WORKAROUND_128K_MAX_TRANS flag, if set either in the workarounds + * module parameter or in the sbp2_workarounds_table[], will override the + * value of max_sectors. We should use sbp2_workarounds_table[] to cover any + * bridge chip which becomes known to need the 255 sectors limit. + */ +static int sbp2_max_sectors; +module_param_named(max_sectors, sbp2_max_sectors, int, 0444); +MODULE_PARM_DESC(max_sectors, "Change max sectors per I/O supported " + "(default = 0 = use SCSI stack's default)"); + +/* + * Exclusive login to sbp2 device? In most cases, the sbp2 driver should + * do an exclusive login, as it's generally unsafe to have two hosts + * talking to a single sbp2 device at the same time (filesystem coherency, + * etc.). If you're running an sbp2 device that supports multiple logins, + * and you're either running read-only filesystems or some sort of special + * filesystem supporting multiple hosts, e.g. OpenGFS, Oracle Cluster + * File System, or Lustre, then set exclusive_login to zero. + * + * So far only bridges from Oxford Semiconductor are known to support + * concurrent logins. Depending on firmware, four or two concurrent logins + * are possible on OXFW911 and newer Oxsemi bridges. + */ +static int sbp2_exclusive_login = 1; +module_param_named(exclusive_login, sbp2_exclusive_login, bool, 0644); +MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device " + "(default = Y, use N for concurrent initiators)"); + +/* + * If any of the following workarounds is required for your device to work, + * please submit the kernel messages logged by sbp2 to the linux1394-devel + * mailing list. + * + * - 128kB max transfer + * Limit transfer size. Necessary for some old bridges. + * + * - 36 byte inquiry + * When scsi_mod probes the device, let the inquiry command look like that + * from MS Windows. + * + * - skip mode page 8 + * Suppress sending of mode_sense for mode page 8 if the device pretends to + * support the SCSI Primary Block commands instead of Reduced Block Commands. + * + * - fix capacity + * Tell sd_mod to correct the last sector number reported by read_capacity. + * Avoids access beyond actual disk limits on devices with an off-by-one bug. + * Don't use this with devices which don't have this bug. + * + * - delay inquiry + * Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry. + * + * - power condition + * Set the power condition field in the START STOP UNIT commands sent by + * sd_mod on suspend, resume, and shutdown (if manage_start_stop is on). + * Some disks need this to spin down or to resume properly. + * + * - override internal blacklist + * Instead of adding to the built-in blacklist, use only the workarounds + * specified in the module load parameter. + * Useful if a blacklist entry interfered with a non-broken device. + */ +static int sbp2_default_workarounds; +module_param_named(workarounds, sbp2_default_workarounds, int, 0644); +MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0" + ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS) + ", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36) + ", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8) + ", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY) + ", delay inquiry = " __stringify(SBP2_WORKAROUND_DELAY_INQUIRY) + ", set power condition in start stop unit = " + __stringify(SBP2_WORKAROUND_POWER_CONDITION) + ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE) + ", or a combination)"); + +/* + * This influences the format of the sysfs attribute + * /sys/bus/scsi/devices/.../ieee1394_id. + * + * The default format is like in older kernels: %016Lx:%d:%d + * It contains the target's EUI-64, a number given to the logical unit by + * the ieee1394 driver's nodemgr (starting at 0), and the LUN. + * + * The long format is: %016Lx:%06x:%04x + * It contains the target's EUI-64, the unit directory's directory_ID as per + * IEEE 1212 clause 7.7.19, and the LUN. This format comes closest to the + * format of SBP(-3) target port and logical unit identifier as per SAM (SCSI + * Architecture Model) rev.2 to 4 annex A. Therefore and because it is + * independent of the implementation of the ieee1394 nodemgr, the longer format + * is recommended for future use. + */ +static int sbp2_long_sysfs_ieee1394_id; +module_param_named(long_ieee1394_id, sbp2_long_sysfs_ieee1394_id, bool, 0644); +MODULE_PARM_DESC(long_ieee1394_id, "8+3+2 bytes format of ieee1394_id in sysfs " + "(default = backwards-compatible = N, SAM-conforming = Y)"); + + +#define SBP2_INFO(fmt, args...) HPSB_INFO("sbp2: "fmt, ## args) +#define SBP2_ERR(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args) + +/* + * Globals + */ +static void sbp2scsi_complete_all_commands(struct sbp2_lu *, u32); +static void sbp2scsi_complete_command(struct sbp2_lu *, u32, struct scsi_cmnd *, + void (*)(struct scsi_cmnd *)); +static struct sbp2_lu *sbp2_alloc_device(struct unit_directory *); +static int sbp2_start_device(struct sbp2_lu *); +static void sbp2_remove_device(struct sbp2_lu *); +static int sbp2_login_device(struct sbp2_lu *); +static int sbp2_reconnect_device(struct sbp2_lu *); +static int sbp2_logout_device(struct sbp2_lu *); +static void sbp2_host_reset(struct hpsb_host *); +static int sbp2_handle_status_write(struct hpsb_host *, int, int, quadlet_t *, + u64, size_t, u16); +static int sbp2_agent_reset(struct sbp2_lu *, int); +static void sbp2_parse_unit_directory(struct sbp2_lu *, + struct unit_directory *); +static int sbp2_set_busy_timeout(struct sbp2_lu *); +static int sbp2_max_speed_and_size(struct sbp2_lu *); + + +static const u8 sbp2_speedto_max_payload[] = { 0x7, 0x8, 0x9, 0xA, 0xB, 0xC }; + +static DEFINE_RWLOCK(sbp2_hi_logical_units_lock); + +static struct hpsb_highlevel sbp2_highlevel = { + .name = SBP2_DEVICE_NAME, + .host_reset = sbp2_host_reset, +}; + +static struct hpsb_address_ops sbp2_ops = { + .write = sbp2_handle_status_write +}; + +#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA +static int sbp2_handle_physdma_write(struct hpsb_host *, int, int, quadlet_t *, + u64, size_t, u16); +static int sbp2_handle_physdma_read(struct hpsb_host *, int, quadlet_t *, u64, + size_t, u16); + +static struct hpsb_address_ops sbp2_physdma_ops = { + .read = sbp2_handle_physdma_read, + .write = sbp2_handle_physdma_write, +}; +#endif + + +/* + * Interface to driver core and IEEE 1394 core + */ +static struct ieee1394_device_id sbp2_id_table[] = { + { + .match_flags = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION, + .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY & 0xffffff, + .version = SBP2_SW_VERSION_ENTRY & 0xffffff}, + {} +}; +MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table); + +static int sbp2_probe(struct device *); +static int sbp2_remove(struct device *); +static int sbp2_update(struct unit_directory *); + +static struct hpsb_protocol_driver sbp2_driver = { + .name = SBP2_DEVICE_NAME, + .id_table = sbp2_id_table, + .update = sbp2_update, + .driver = { + .probe = sbp2_probe, + .remove = sbp2_remove, + }, +}; + + +/* + * Interface to SCSI core + */ +static int sbp2scsi_queuecommand(struct scsi_cmnd *, + void (*)(struct scsi_cmnd *)); +static int sbp2scsi_abort(struct scsi_cmnd *); +static int sbp2scsi_reset(struct scsi_cmnd *); +static int sbp2scsi_slave_alloc(struct scsi_device *); +static int sbp2scsi_slave_configure(struct scsi_device *); +static void sbp2scsi_slave_destroy(struct scsi_device *); +static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *, + struct device_attribute *, char *); + +static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL); + +static struct device_attribute *sbp2_sysfs_sdev_attrs[] = { + &dev_attr_ieee1394_id, + NULL +}; + +static struct scsi_host_template sbp2_shost_template = { + .module = THIS_MODULE, + .name = "SBP-2 IEEE-1394", + .proc_name = SBP2_DEVICE_NAME, + .queuecommand = sbp2scsi_queuecommand, + .eh_abort_handler = sbp2scsi_abort, + .eh_device_reset_handler = sbp2scsi_reset, + .slave_alloc = sbp2scsi_slave_alloc, + .slave_configure = sbp2scsi_slave_configure, + .slave_destroy = sbp2scsi_slave_destroy, + .this_id = -1, + .sg_tablesize = SG_ALL, + .use_clustering = ENABLE_CLUSTERING, + .cmd_per_lun = SBP2_MAX_CMDS, + .can_queue = SBP2_MAX_CMDS, + .sdev_attrs = sbp2_sysfs_sdev_attrs, +}; + +/* for match-all entries in sbp2_workarounds_table */ +#define SBP2_ROM_VALUE_WILDCARD 0x1000000 + +/* + * List of devices with known bugs. + * + * The firmware_revision field, masked with 0xffff00, is the best indicator + * for the type of bridge chip of a device. It yields a few false positives + * but this did not break correctly behaving devices so far. + */ +static const struct { + u32 firmware_revision; + u32 model_id; + unsigned workarounds; +} sbp2_workarounds_table[] = { + /* DViCO Momobay CX-1 with TSB42AA9 bridge */ { + .firmware_revision = 0x002800, + .model_id = 0x001010, + .workarounds = SBP2_WORKAROUND_INQUIRY_36 | + SBP2_WORKAROUND_MODE_SENSE_8 | + SBP2_WORKAROUND_POWER_CONDITION, + }, + /* DViCO Momobay FX-3A with TSB42AA9A bridge */ { + .firmware_revision = 0x002800, + .model_id = 0x000000, + .workarounds = SBP2_WORKAROUND_DELAY_INQUIRY | + SBP2_WORKAROUND_POWER_CONDITION, + }, + /* Initio bridges, actually only needed for some older ones */ { + .firmware_revision = 0x000200, + .model_id = SBP2_ROM_VALUE_WILDCARD, + .workarounds = SBP2_WORKAROUND_INQUIRY_36, + }, + /* PL-3507 bridge with Prolific firmware */ { + .firmware_revision = 0x012800, + .model_id = SBP2_ROM_VALUE_WILDCARD, + .workarounds = SBP2_WORKAROUND_POWER_CONDITION, + }, + /* Symbios bridge */ { + .firmware_revision = 0xa0b800, + .model_id = SBP2_ROM_VALUE_WILDCARD, + .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, + }, + /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ { + .firmware_revision = 0x002600, + .model_id = SBP2_ROM_VALUE_WILDCARD, + .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, + }, + /* + * iPod 2nd generation: needs 128k max transfer size workaround + * iPod 3rd generation: needs fix capacity workaround + */ + { + .firmware_revision = 0x0a2700, + .model_id = 0x000000, + .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS | + SBP2_WORKAROUND_FIX_CAPACITY, + }, + /* iPod 4th generation */ { + .firmware_revision = 0x0a2700, + .model_id = 0x000021, + .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, + }, + /* iPod mini */ { + .firmware_revision = 0x0a2700, + .model_id = 0x000022, + .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, + }, + /* iPod mini */ { + .firmware_revision = 0x0a2700, + .model_id = 0x000023, + .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, + }, + /* iPod Photo */ { + .firmware_revision = 0x0a2700, + .model_id = 0x00007e, + .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, + } +}; + +/************************************** + * General utility functions + **************************************/ + +#ifndef __BIG_ENDIAN +/* + * Converts a buffer from be32 to cpu byte ordering. Length is in bytes. + */ +static inline void sbp2util_be32_to_cpu_buffer(void *buffer, int length) +{ + u32 *temp = buffer; + + for (length = (length >> 2); length--; ) + temp[length] = be32_to_cpu(temp[length]); +} + +/* + * Converts a buffer from cpu to be32 byte ordering. Length is in bytes. + */ +static inline void sbp2util_cpu_to_be32_buffer(void *buffer, int length) +{ + u32 *temp = buffer; + + for (length = (length >> 2); length--; ) + temp[length] = cpu_to_be32(temp[length]); +} +#else /* BIG_ENDIAN */ +/* Why waste the cpu cycles? */ +#define sbp2util_be32_to_cpu_buffer(x,y) do {} while (0) +#define sbp2util_cpu_to_be32_buffer(x,y) do {} while (0) +#endif + +static DECLARE_WAIT_QUEUE_HEAD(sbp2_access_wq); + +/* + * Waits for completion of an SBP-2 access request. + * Returns nonzero if timed out or prematurely interrupted. + */ +static int sbp2util_access_timeout(struct sbp2_lu *lu, int timeout) +{ + long leftover; + + leftover = wait_event_interruptible_timeout( + sbp2_access_wq, lu->access_complete, timeout); + lu->access_complete = 0; + return leftover <= 0; +} + +static void sbp2_free_packet(void *packet) +{ + hpsb_free_tlabel(packet); + hpsb_free_packet(packet); +} + +/* + * This is much like hpsb_node_write(), except it ignores the response + * subaction and returns immediately. Can be used from atomic context. + */ +static int sbp2util_node_write_no_wait(struct node_entry *ne, u64 addr, + quadlet_t *buf, size_t len) +{ + struct hpsb_packet *packet; + + packet = hpsb_make_writepacket(ne->host, ne->nodeid, addr, buf, len); + if (!packet) + return -ENOMEM; + + hpsb_set_packet_complete_task(packet, sbp2_free_packet, packet); + hpsb_node_fill_packet(ne, packet); + if (hpsb_send_packet(packet) < 0) { + sbp2_free_packet(packet); + return -EIO; + } + return 0; +} + +static void sbp2util_notify_fetch_agent(struct sbp2_lu *lu, u64 offset, + quadlet_t *data, size_t len) +{ + /* There is a small window after a bus reset within which the node + * entry's generation is current but the reconnect wasn't completed. */ + if (unlikely(atomic_read(&lu->state) == SBP2LU_STATE_IN_RESET)) + return; + + if (hpsb_node_write(lu->ne, lu->command_block_agent_addr + offset, + data, len)) + SBP2_ERR("sbp2util_notify_fetch_agent failed."); + + /* Now accept new SCSI commands, unless a bus reset happended during + * hpsb_node_write. */ + if (likely(atomic_read(&lu->state) != SBP2LU_STATE_IN_RESET)) + scsi_unblock_requests(lu->shost); +} + +static void sbp2util_write_orb_pointer(struct work_struct *work) +{ + struct sbp2_lu *lu = container_of(work, struct sbp2_lu, protocol_work); + quadlet_t data[2]; + + data[0] = ORB_SET_NODE_ID(lu->hi->host->node_id); + data[1] = lu->last_orb_dma; + sbp2util_cpu_to_be32_buffer(data, 8); + sbp2util_notify_fetch_agent(lu, SBP2_ORB_POINTER_OFFSET, data, 8); +} + +static void sbp2util_write_doorbell(struct work_struct *work) +{ + struct sbp2_lu *lu = container_of(work, struct sbp2_lu, protocol_work); + + sbp2util_notify_fetch_agent(lu, SBP2_DOORBELL_OFFSET, NULL, 4); +} + +static int sbp2util_create_command_orb_pool(struct sbp2_lu *lu) +{ + struct sbp2_command_info *cmd; + struct device *dmadev = lu->hi->host->device.parent; + int i, orbs = sbp2_serialize_io ? 2 : SBP2_MAX_CMDS; + + for (i = 0; i < orbs; i++) { + cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); + if (!cmd) + goto failed_alloc; + + cmd->command_orb_dma = + dma_map_single(dmadev, &cmd->command_orb, + sizeof(struct sbp2_command_orb), + DMA_TO_DEVICE); + if (dma_mapping_error(dmadev, cmd->command_orb_dma)) + goto failed_orb; + + cmd->sge_dma = + dma_map_single(dmadev, &cmd->scatter_gather_element, + sizeof(cmd->scatter_gather_element), + DMA_TO_DEVICE); + if (dma_mapping_error(dmadev, cmd->sge_dma)) + goto failed_sge; + + INIT_LIST_HEAD(&cmd->list); + list_add_tail(&cmd->list, &lu->cmd_orb_completed); + } + return 0; + +failed_sge: + dma_unmap_single(dmadev, cmd->command_orb_dma, + sizeof(struct sbp2_command_orb), DMA_TO_DEVICE); +failed_orb: + kfree(cmd); +failed_alloc: + return -ENOMEM; +} + +static void sbp2util_remove_command_orb_pool(struct sbp2_lu *lu, + struct hpsb_host *host) +{ + struct list_head *lh, *next; + struct sbp2_command_info *cmd; + unsigned long flags; + + spin_lock_irqsave(&lu->cmd_orb_lock, flags); + if (!list_empty(&lu->cmd_orb_completed)) + list_for_each_safe(lh, next, &lu->cmd_orb_completed) { + cmd = list_entry(lh, struct sbp2_command_info, list); + dma_unmap_single(host->device.parent, + cmd->command_orb_dma, + sizeof(struct sbp2_command_orb), + DMA_TO_DEVICE); + dma_unmap_single(host->device.parent, cmd->sge_dma, + sizeof(cmd->scatter_gather_element), + DMA_TO_DEVICE); + kfree(cmd); + } + spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); + return; +} + +/* + * Finds the sbp2_command for a given outstanding command ORB. + * Only looks at the in-use list. + */ +static struct sbp2_command_info *sbp2util_find_command_for_orb( + struct sbp2_lu *lu, dma_addr_t orb) +{ + struct sbp2_command_info *cmd; + unsigned long flags; + + spin_lock_irqsave(&lu->cmd_orb_lock, flags); + if (!list_empty(&lu->cmd_orb_inuse)) + list_for_each_entry(cmd, &lu->cmd_orb_inuse, list) + if (cmd->command_orb_dma == orb) { + spin_unlock_irqrestore( + &lu->cmd_orb_lock, flags); + return cmd; + } + spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); + return NULL; +} + +/* + * Finds the sbp2_command for a given outstanding SCpnt. + * Only looks at the in-use list. + * Must be called with lu->cmd_orb_lock held. + */ +static struct sbp2_command_info *sbp2util_find_command_for_SCpnt( + struct sbp2_lu *lu, void *SCpnt) +{ + struct sbp2_command_info *cmd; + + if (!list_empty(&lu->cmd_orb_inuse)) + list_for_each_entry(cmd, &lu->cmd_orb_inuse, list) + if (cmd->Current_SCpnt == SCpnt) + return cmd; + return NULL; +} + +static struct sbp2_command_info *sbp2util_allocate_command_orb( + struct sbp2_lu *lu, + struct scsi_cmnd *Current_SCpnt, + void (*Current_done)(struct scsi_cmnd *)) +{ + struct list_head *lh; + struct sbp2_command_info *cmd = NULL; + unsigned long flags; + + spin_lock_irqsave(&lu->cmd_orb_lock, flags); + if (!list_empty(&lu->cmd_orb_completed)) { + lh = lu->cmd_orb_completed.next; + list_del(lh); + cmd = list_entry(lh, struct sbp2_command_info, list); + cmd->Current_done = Current_done; + cmd->Current_SCpnt = Current_SCpnt; + list_add_tail(&cmd->list, &lu->cmd_orb_inuse); + } else + SBP2_ERR("%s: no orbs available", __func__); + spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); + return cmd; +} + +/* + * Unmaps the DMAs of a command and moves the command to the completed ORB list. + * Must be called with lu->cmd_orb_lock held. + */ +static void sbp2util_mark_command_completed(struct sbp2_lu *lu, + struct sbp2_command_info *cmd) +{ + if (scsi_sg_count(cmd->Current_SCpnt)) + dma_unmap_sg(lu->ud->ne->host->device.parent, + scsi_sglist(cmd->Current_SCpnt), + scsi_sg_count(cmd->Current_SCpnt), + cmd->Current_SCpnt->sc_data_direction); + list_move_tail(&cmd->list, &lu->cmd_orb_completed); +} + +/* + * Is lu valid? Is the 1394 node still present? + */ +static inline int sbp2util_node_is_available(struct sbp2_lu *lu) +{ + return lu && lu->ne && !lu->ne->in_limbo; +} + +/********************************************* + * IEEE-1394 core driver stack related section + *********************************************/ + +static int sbp2_probe(struct device *dev) +{ + struct unit_directory *ud; + struct sbp2_lu *lu; + + ud = container_of(dev, struct unit_directory, device); + + /* Don't probe UD's that have the LUN flag. We'll probe the LUN(s) + * instead. */ + if (ud->flags & UNIT_DIRECTORY_HAS_LUN_DIRECTORY) + return -ENODEV; + + lu = sbp2_alloc_device(ud); + if (!lu) + return -ENOMEM; + + sbp2_parse_unit_directory(lu, ud); + return sbp2_start_device(lu); +} + +static int sbp2_remove(struct device *dev) +{ + struct unit_directory *ud; + struct sbp2_lu *lu; + struct scsi_device *sdev; + + ud = container_of(dev, struct unit_directory, device); + lu = ud->device.driver_data; + if (!lu) + return 0; + + if (lu->shost) { + /* Get rid of enqueued commands if there is no chance to + * send them. */ + if (!sbp2util_node_is_available(lu)) + sbp2scsi_complete_all_commands(lu, DID_NO_CONNECT); + /* scsi_remove_device() may trigger shutdown functions of SCSI + * highlevel drivers which would deadlock if blocked. */ + atomic_set(&lu->state, SBP2LU_STATE_IN_SHUTDOWN); + scsi_unblock_requests(lu->shost); + } + sdev = lu->sdev; + if (sdev) { + lu->sdev = NULL; + scsi_remove_device(sdev); + } + + sbp2_logout_device(lu); + sbp2_remove_device(lu); + + return 0; +} + +static int sbp2_update(struct unit_directory *ud) +{ + struct sbp2_lu *lu = ud->device.driver_data; + + if (sbp2_reconnect_device(lu) != 0) { + /* + * Reconnect failed. If another bus reset happened, + * let nodemgr proceed and call sbp2_update again later + * (or sbp2_remove if this node went away). + */ + if (!hpsb_node_entry_valid(lu->ne)) + return 0; + /* + * Or the target rejected the reconnect because we weren't + * fast enough. Try a regular login, but first log out + * just in case of any weirdness. + */ + sbp2_logout_device(lu); + + if (sbp2_login_device(lu) != 0) { + if (!hpsb_node_entry_valid(lu->ne)) + return 0; + + /* Maybe another initiator won the login. */ + SBP2_ERR("Failed to reconnect to sbp2 device!"); + return -EBUSY; + } + } + + sbp2_set_busy_timeout(lu); + sbp2_agent_reset(lu, 1); + sbp2_max_speed_and_size(lu); + + /* Complete any pending commands with busy (so they get retried) + * and remove them from our queue. */ + sbp2scsi_complete_all_commands(lu, DID_BUS_BUSY); + + /* Accept new commands unless there was another bus reset in the + * meantime. */ + if (hpsb_node_entry_valid(lu->ne)) { + atomic_set(&lu->state, SBP2LU_STATE_RUNNING); + scsi_unblock_requests(lu->shost); + } + return 0; +} + +static struct sbp2_lu *sbp2_alloc_device(struct unit_directory *ud) +{ + struct sbp2_fwhost_info *hi; + struct Scsi_Host *shost = NULL; + struct sbp2_lu *lu = NULL; + unsigned long flags; + + lu = kzalloc(sizeof(*lu), GFP_KERNEL); + if (!lu) { + SBP2_ERR("failed to create lu"); + goto failed_alloc; + } + + lu->ne = ud->ne; + lu->ud = ud; + lu->speed_code = IEEE1394_SPEED_100; + lu->max_payload_size = sbp2_speedto_max_payload[IEEE1394_SPEED_100]; + lu->status_fifo_addr = CSR1212_INVALID_ADDR_SPACE; + INIT_LIST_HEAD(&lu->cmd_orb_inuse); + INIT_LIST_HEAD(&lu->cmd_orb_completed); + INIT_LIST_HEAD(&lu->lu_list); + spin_lock_init(&lu->cmd_orb_lock); + atomic_set(&lu->state, SBP2LU_STATE_RUNNING); + INIT_WORK(&lu->protocol_work, NULL); + + ud->device.driver_data = lu; + + hi = hpsb_get_hostinfo(&sbp2_highlevel, ud->ne->host); + if (!hi) { + hi = hpsb_create_hostinfo(&sbp2_highlevel, ud->ne->host, + sizeof(*hi)); + if (!hi) { + SBP2_ERR("failed to allocate hostinfo"); + goto failed_alloc; + } + hi->host = ud->ne->host; + INIT_LIST_HEAD(&hi->logical_units); + +#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA + /* Handle data movement if physical dma is not + * enabled or not supported on host controller */ + if (!hpsb_register_addrspace(&sbp2_highlevel, ud->ne->host, + &sbp2_physdma_ops, + 0x0ULL, 0xfffffffcULL)) { + SBP2_ERR("failed to register lower 4GB address range"); + goto failed_alloc; + } +#endif + } + + if (dma_get_max_seg_size(hi->host->device.parent) > SBP2_MAX_SEG_SIZE) + BUG_ON(dma_set_max_seg_size(hi->host->device.parent, + SBP2_MAX_SEG_SIZE)); + + /* Prevent unloading of the 1394 host */ + if (!try_module_get(hi->host->driver->owner)) { + SBP2_ERR("failed to get a reference on 1394 host driver"); + goto failed_alloc; + } + + lu->hi = hi; + + write_lock_irqsave(&sbp2_hi_logical_units_lock, flags); + list_add_tail(&lu->lu_list, &hi->logical_units); + write_unlock_irqrestore(&sbp2_hi_logical_units_lock, flags); + + /* Register the status FIFO address range. We could use the same FIFO + * for targets at different nodes. However we need different FIFOs per + * target in order to support multi-unit devices. + * The FIFO is located out of the local host controller's physical range + * but, if possible, within the posted write area. Status writes will + * then be performed as unified transactions. This slightly reduces + * bandwidth usage, and some Prolific based devices seem to require it. + */ + lu->status_fifo_addr = hpsb_allocate_and_register_addrspace( + &sbp2_highlevel, ud->ne->host, &sbp2_ops, + sizeof(struct sbp2_status_block), sizeof(quadlet_t), + ud->ne->host->low_addr_space, CSR1212_ALL_SPACE_END); + if (lu->status_fifo_addr == CSR1212_INVALID_ADDR_SPACE) { + SBP2_ERR("failed to allocate status FIFO address range"); + goto failed_alloc; + } + + shost = scsi_host_alloc(&sbp2_shost_template, sizeof(unsigned long)); + if (!shost) { + SBP2_ERR("failed to register scsi host"); + goto failed_alloc; + } + + shost->hostdata[0] = (unsigned long)lu; + + if (!scsi_add_host(shost, &ud->device)) { + lu->shost = shost; + return lu; + } + + SBP2_ERR("failed to add scsi host"); + scsi_host_put(shost); + +failed_alloc: + sbp2_remove_device(lu); + return NULL; +} + +static void sbp2_host_reset(struct hpsb_host *host) +{ + struct sbp2_fwhost_info *hi; + struct sbp2_lu *lu; + unsigned long flags; + + hi = hpsb_get_hostinfo(&sbp2_highlevel, host); + if (!hi) + return; + + read_lock_irqsave(&sbp2_hi_logical_units_lock, flags); + + list_for_each_entry(lu, &hi->logical_units, lu_list) + if (atomic_cmpxchg(&lu->state, + SBP2LU_STATE_RUNNING, SBP2LU_STATE_IN_RESET) + == SBP2LU_STATE_RUNNING) + scsi_block_requests(lu->shost); + + read_unlock_irqrestore(&sbp2_hi_logical_units_lock, flags); +} + +static int sbp2_start_device(struct sbp2_lu *lu) +{ + struct sbp2_fwhost_info *hi = lu->hi; + int error; + + lu->login_response = dma_alloc_coherent(hi->host->device.parent, + sizeof(struct sbp2_login_response), + &lu->login_response_dma, GFP_KERNEL); + if (!lu->login_response) + goto alloc_fail; + + lu->query_logins_orb = dma_alloc_coherent(hi->host->device.parent, + sizeof(struct sbp2_query_logins_orb), + &lu->query_logins_orb_dma, GFP_KERNEL); + if (!lu->query_logins_orb) + goto alloc_fail; + + lu->query_logins_response = dma_alloc_coherent(hi->host->device.parent, + sizeof(struct sbp2_query_logins_response), + &lu->query_logins_response_dma, GFP_KERNEL); + if (!lu->query_logins_response) + goto alloc_fail; + + lu->reconnect_orb = dma_alloc_coherent(hi->host->device.parent, + sizeof(struct sbp2_reconnect_orb), + &lu->reconnect_orb_dma, GFP_KERNEL); + if (!lu->reconnect_orb) + goto alloc_fail; + + lu->logout_orb = dma_alloc_coherent(hi->host->device.parent, + sizeof(struct sbp2_logout_orb), + &lu->logout_orb_dma, GFP_KERNEL); + if (!lu->logout_orb) + goto alloc_fail; + + lu->login_orb = dma_alloc_coherent(hi->host->device.parent, + sizeof(struct sbp2_login_orb), + &lu->login_orb_dma, GFP_KERNEL); + if (!lu->login_orb) + goto alloc_fail; + + if (sbp2util_create_command_orb_pool(lu)) + goto alloc_fail; + + /* Wait a second before trying to log in. Previously logged in + * initiators need a chance to reconnect. */ + if (msleep_interruptible(1000)) { + sbp2_remove_device(lu); + return -EINTR; + } + + if (sbp2_login_device(lu)) { + sbp2_remove_device(lu); + return -EBUSY; + } + + sbp2_set_busy_timeout(lu); + sbp2_agent_reset(lu, 1); + sbp2_max_speed_and_size(lu); + + if (lu->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY) + ssleep(SBP2_INQUIRY_DELAY); + + error = scsi_add_device(lu->shost, 0, lu->ud->id, 0); + if (error) { + SBP2_ERR("scsi_add_device failed"); + sbp2_logout_device(lu); + sbp2_remove_device(lu); + return error; + } + + return 0; + +alloc_fail: + SBP2_ERR("Could not allocate memory for lu"); + sbp2_remove_device(lu); + return -ENOMEM; +} + +static void sbp2_remove_device(struct sbp2_lu *lu) +{ + struct sbp2_fwhost_info *hi; + unsigned long flags; + + if (!lu) + return; + hi = lu->hi; + if (!hi) + goto no_hi; + + if (lu->shost) { + scsi_remove_host(lu->shost); + scsi_host_put(lu->shost); + } + flush_scheduled_work(); + sbp2util_remove_command_orb_pool(lu, hi->host); + + write_lock_irqsave(&sbp2_hi_logical_units_lock, flags); + list_del(&lu->lu_list); + write_unlock_irqrestore(&sbp2_hi_logical_units_lock, flags); + + if (lu->login_response) + dma_free_coherent(hi->host->device.parent, + sizeof(struct sbp2_login_response), + lu->login_response, + lu->login_response_dma); + if (lu->login_orb) + dma_free_coherent(hi->host->device.parent, + sizeof(struct sbp2_login_orb), + lu->login_orb, + lu->login_orb_dma); + if (lu->reconnect_orb) + dma_free_coherent(hi->host->device.parent, + sizeof(struct sbp2_reconnect_orb), + lu->reconnect_orb, + lu->reconnect_orb_dma); + if (lu->logout_orb) + dma_free_coherent(hi->host->device.parent, + sizeof(struct sbp2_logout_orb), + lu->logout_orb, + lu->logout_orb_dma); + if (lu->query_logins_orb) + dma_free_coherent(hi->host->device.parent, + sizeof(struct sbp2_query_logins_orb), + lu->query_logins_orb, + lu->query_logins_orb_dma); + if (lu->query_logins_response) + dma_free_coherent(hi->host->device.parent, + sizeof(struct sbp2_query_logins_response), + lu->query_logins_response, + lu->query_logins_response_dma); + + if (lu->status_fifo_addr != CSR1212_INVALID_ADDR_SPACE) + hpsb_unregister_addrspace(&sbp2_highlevel, hi->host, + lu->status_fifo_addr); + + lu->ud->device.driver_data = NULL; + + module_put(hi->host->driver->owner); +no_hi: + kfree(lu); +} + +#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA +/* + * Deal with write requests on adapters which do not support physical DMA or + * have it switched off. + */ +static int sbp2_handle_physdma_write(struct hpsb_host *host, int nodeid, + int destid, quadlet_t *data, u64 addr, + size_t length, u16 flags) +{ + memcpy(bus_to_virt((u32) addr), data, length); + return RCODE_COMPLETE; +} + +/* + * Deal with read requests on adapters which do not support physical DMA or + * have it switched off. + */ +static int sbp2_handle_physdma_read(struct hpsb_host *host, int nodeid, + quadlet_t *data, u64 addr, size_t length, + u16 flags) +{ + memcpy(data, bus_to_virt((u32) addr), length); + return RCODE_COMPLETE; +} +#endif + +/************************************** + * SBP-2 protocol related section + **************************************/ + +static int sbp2_query_logins(struct sbp2_lu *lu) +{ + struct sbp2_fwhost_info *hi = lu->hi; + quadlet_t data[2]; + int max_logins; + int active_logins; + + lu->query_logins_orb->reserved1 = 0x0; + lu->query_logins_orb->reserved2 = 0x0; + + lu->query_logins_orb->query_response_lo = lu->query_logins_response_dma; + lu->query_logins_orb->query_response_hi = + ORB_SET_NODE_ID(hi->host->node_id); + lu->query_logins_orb->lun_misc = + ORB_SET_FUNCTION(SBP2_QUERY_LOGINS_REQUEST); + lu->query_logins_orb->lun_misc |= ORB_SET_NOTIFY(1); + lu->query_logins_orb->lun_misc |= ORB_SET_LUN(lu->lun); + + lu->query_logins_orb->reserved_resp_length = + ORB_SET_QUERY_LOGINS_RESP_LENGTH( + sizeof(struct sbp2_query_logins_response)); + + lu->query_logins_orb->status_fifo_hi = + ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); + lu->query_logins_orb->status_fifo_lo = + ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); + + sbp2util_cpu_to_be32_buffer(lu->query_logins_orb, + sizeof(struct sbp2_query_logins_orb)); + + memset(lu->query_logins_response, 0, + sizeof(struct sbp2_query_logins_response)); + + data[0] = ORB_SET_NODE_ID(hi->host->node_id); + data[1] = lu->query_logins_orb_dma; + sbp2util_cpu_to_be32_buffer(data, 8); + + hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); + + if (sbp2util_access_timeout(lu, 2*HZ)) { + SBP2_INFO("Error querying logins to SBP-2 device - timed out"); + return -EIO; + } + + if (lu->status_block.ORB_offset_lo != lu->query_logins_orb_dma) { + SBP2_INFO("Error querying logins to SBP-2 device - timed out"); + return -EIO; + } + + if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) { + SBP2_INFO("Error querying logins to SBP-2 device - failed"); + return -EIO; + } + + sbp2util_cpu_to_be32_buffer(lu->query_logins_response, + sizeof(struct sbp2_query_logins_response)); + + max_logins = RESPONSE_GET_MAX_LOGINS( + lu->query_logins_response->length_max_logins); + SBP2_INFO("Maximum concurrent logins supported: %d", max_logins); + + active_logins = RESPONSE_GET_ACTIVE_LOGINS( + lu->query_logins_response->length_max_logins); + SBP2_INFO("Number of active logins: %d", active_logins); + + if (active_logins >= max_logins) { + return -EIO; + } + + return 0; +} + +static int sbp2_login_device(struct sbp2_lu *lu) +{ + struct sbp2_fwhost_info *hi = lu->hi; + quadlet_t data[2]; + + if (!lu->login_orb) + return -EIO; + + if (!sbp2_exclusive_login && sbp2_query_logins(lu)) { + SBP2_INFO("Device does not support any more concurrent logins"); + return -EIO; + } + + /* assume no password */ + lu->login_orb->password_hi = 0; + lu->login_orb->password_lo = 0; + + lu->login_orb->login_response_lo = lu->login_response_dma; + lu->login_orb->login_response_hi = ORB_SET_NODE_ID(hi->host->node_id); + lu->login_orb->lun_misc = ORB_SET_FUNCTION(SBP2_LOGIN_REQUEST); + + /* one second reconnect time */ + lu->login_orb->lun_misc |= ORB_SET_RECONNECT(0); + lu->login_orb->lun_misc |= ORB_SET_EXCLUSIVE(sbp2_exclusive_login); + lu->login_orb->lun_misc |= ORB_SET_NOTIFY(1); + lu->login_orb->lun_misc |= ORB_SET_LUN(lu->lun); + + lu->login_orb->passwd_resp_lengths = + ORB_SET_LOGIN_RESP_LENGTH(sizeof(struct sbp2_login_response)); + + lu->login_orb->status_fifo_hi = + ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); + lu->login_orb->status_fifo_lo = + ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); + + sbp2util_cpu_to_be32_buffer(lu->login_orb, + sizeof(struct sbp2_login_orb)); + + memset(lu->login_response, 0, sizeof(struct sbp2_login_response)); + + data[0] = ORB_SET_NODE_ID(hi->host->node_id); + data[1] = lu->login_orb_dma; + sbp2util_cpu_to_be32_buffer(data, 8); + + hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); + + /* wait up to 20 seconds for login status */ + if (sbp2util_access_timeout(lu, 20*HZ)) { + SBP2_ERR("Error logging into SBP-2 device - timed out"); + return -EIO; + } + + /* make sure that the returned status matches the login ORB */ + if (lu->status_block.ORB_offset_lo != lu->login_orb_dma) { + SBP2_ERR("Error logging into SBP-2 device - timed out"); + return -EIO; + } + + if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) { + SBP2_ERR("Error logging into SBP-2 device - failed"); + return -EIO; + } + + sbp2util_cpu_to_be32_buffer(lu->login_response, + sizeof(struct sbp2_login_response)); + lu->command_block_agent_addr = + ((u64)lu->login_response->command_block_agent_hi) << 32; + lu->command_block_agent_addr |= + ((u64)lu->login_response->command_block_agent_lo); + lu->command_block_agent_addr &= 0x0000ffffffffffffULL; + + SBP2_INFO("Logged into SBP-2 device"); + return 0; +} + +static int sbp2_logout_device(struct sbp2_lu *lu) +{ + struct sbp2_fwhost_info *hi = lu->hi; + quadlet_t data[2]; + int error; + + lu->logout_orb->reserved1 = 0x0; + lu->logout_orb->reserved2 = 0x0; + lu->logout_orb->reserved3 = 0x0; + lu->logout_orb->reserved4 = 0x0; + + lu->logout_orb->login_ID_misc = ORB_SET_FUNCTION(SBP2_LOGOUT_REQUEST); + lu->logout_orb->login_ID_misc |= + ORB_SET_LOGIN_ID(lu->login_response->length_login_ID); + lu->logout_orb->login_ID_misc |= ORB_SET_NOTIFY(1); + + lu->logout_orb->reserved5 = 0x0; + lu->logout_orb->status_fifo_hi = + ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); + lu->logout_orb->status_fifo_lo = + ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); + + sbp2util_cpu_to_be32_buffer(lu->logout_orb, + sizeof(struct sbp2_logout_orb)); + + data[0] = ORB_SET_NODE_ID(hi->host->node_id); + data[1] = lu->logout_orb_dma; + sbp2util_cpu_to_be32_buffer(data, 8); + + error = hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); + if (error) + return error; + + /* wait up to 1 second for the device to complete logout */ + if (sbp2util_access_timeout(lu, HZ)) + return -EIO; + + SBP2_INFO("Logged out of SBP-2 device"); + return 0; +} + +static int sbp2_reconnect_device(struct sbp2_lu *lu) +{ + struct sbp2_fwhost_info *hi = lu->hi; + quadlet_t data[2]; + int error; + + lu->reconnect_orb->reserved1 = 0x0; + lu->reconnect_orb->reserved2 = 0x0; + lu->reconnect_orb->reserved3 = 0x0; + lu->reconnect_orb->reserved4 = 0x0; + + lu->reconnect_orb->login_ID_misc = + ORB_SET_FUNCTION(SBP2_RECONNECT_REQUEST); + lu->reconnect_orb->login_ID_misc |= + ORB_SET_LOGIN_ID(lu->login_response->length_login_ID); + lu->reconnect_orb->login_ID_misc |= ORB_SET_NOTIFY(1); + + lu->reconnect_orb->reserved5 = 0x0; + lu->reconnect_orb->status_fifo_hi = + ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); + lu->reconnect_orb->status_fifo_lo = + ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); + + sbp2util_cpu_to_be32_buffer(lu->reconnect_orb, + sizeof(struct sbp2_reconnect_orb)); + + data[0] = ORB_SET_NODE_ID(hi->host->node_id); + data[1] = lu->reconnect_orb_dma; + sbp2util_cpu_to_be32_buffer(data, 8); + + error = hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); + if (error) + return error; + + /* wait up to 1 second for reconnect status */ + if (sbp2util_access_timeout(lu, HZ)) { + SBP2_ERR("Error reconnecting to SBP-2 device - timed out"); + return -EIO; + } + + /* make sure that the returned status matches the reconnect ORB */ + if (lu->status_block.ORB_offset_lo != lu->reconnect_orb_dma) { + SBP2_ERR("Error reconnecting to SBP-2 device - timed out"); + return -EIO; + } + + if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) { + SBP2_ERR("Error reconnecting to SBP-2 device - failed"); + return -EIO; + } + + SBP2_INFO("Reconnected to SBP-2 device"); + return 0; +} + +/* + * Set the target node's Single Phase Retry limit. Affects the target's retry + * behaviour if our node is too busy to accept requests. + */ +static int sbp2_set_busy_timeout(struct sbp2_lu *lu) +{ + quadlet_t data; + + data = cpu_to_be32(SBP2_BUSY_TIMEOUT_VALUE); + if (hpsb_node_write(lu->ne, SBP2_BUSY_TIMEOUT_ADDRESS, &data, 4)) + SBP2_ERR("%s error", __func__); + return 0; +} + +static void sbp2_parse_unit_directory(struct sbp2_lu *lu, + struct unit_directory *ud) +{ + struct csr1212_keyval *kv; + struct csr1212_dentry *dentry; + u64 management_agent_addr; + u32 unit_characteristics, firmware_revision; + unsigned workarounds; + int i; + + management_agent_addr = 0; + unit_characteristics = 0; + firmware_revision = 0; + + csr1212_for_each_dir_entry(ud->ne->csr, kv, ud->ud_kv, dentry) { + switch (kv->key.id) { + case CSR1212_KV_ID_DEPENDENT_INFO: + if (kv->key.type == CSR1212_KV_TYPE_CSR_OFFSET) + management_agent_addr = + CSR1212_REGISTER_SPACE_BASE + + (kv->value.csr_offset << 2); + + else if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) + lu->lun = ORB_SET_LUN(kv->value.immediate); + break; + + case SBP2_UNIT_CHARACTERISTICS_KEY: + /* FIXME: This is ignored so far. + * See SBP-2 clause 7.4.8. */ + unit_characteristics = kv->value.immediate; + break; + + case SBP2_FIRMWARE_REVISION_KEY: + firmware_revision = kv->value.immediate; + break; + + default: + /* FIXME: Check for SBP2_DEVICE_TYPE_AND_LUN_KEY. + * Its "ordered" bit has consequences for command ORB + * list handling. See SBP-2 clauses 4.6, 7.4.11, 10.2 */ + break; + } + } + + workarounds = sbp2_default_workarounds; + + if (!(workarounds & SBP2_WORKAROUND_OVERRIDE)) + for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) { + if (sbp2_workarounds_table[i].firmware_revision != + SBP2_ROM_VALUE_WILDCARD && + sbp2_workarounds_table[i].firmware_revision != + (firmware_revision & 0xffff00)) + continue; + if (sbp2_workarounds_table[i].model_id != + SBP2_ROM_VALUE_WILDCARD && + sbp2_workarounds_table[i].model_id != ud->model_id) + continue; + workarounds |= sbp2_workarounds_table[i].workarounds; + break; + } + + if (workarounds) + SBP2_INFO("Workarounds for node " NODE_BUS_FMT ": 0x%x " + "(firmware_revision 0x%06x, vendor_id 0x%06x," + " model_id 0x%06x)", + NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid), + workarounds, firmware_revision, + ud->vendor_id ? ud->vendor_id : ud->ne->vendor_id, + ud->model_id); + + /* We would need one SCSI host template for each target to adjust + * max_sectors on the fly, therefore warn only. */ + if (workarounds & SBP2_WORKAROUND_128K_MAX_TRANS && + (sbp2_max_sectors * 512) > (128 * 1024)) + SBP2_INFO("Node " NODE_BUS_FMT ": Bridge only supports 128KB " + "max transfer size. WARNING: Current max_sectors " + "setting is larger than 128KB (%d sectors)", + NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid), + sbp2_max_sectors); + + /* If this is a logical unit directory entry, process the parent + * to get the values. */ + if (ud->flags & UNIT_DIRECTORY_LUN_DIRECTORY) { + struct unit_directory *parent_ud = container_of( + ud->device.parent, struct unit_directory, device); + sbp2_parse_unit_directory(lu, parent_ud); + } else { + lu->management_agent_addr = management_agent_addr; + lu->workarounds = workarounds; + if (ud->flags & UNIT_DIRECTORY_HAS_LUN) + lu->lun = ORB_SET_LUN(ud->lun); + } +} + +#define SBP2_PAYLOAD_TO_BYTES(p) (1 << ((p) + 2)) + +/* + * This function is called in order to determine the max speed and packet + * size we can use in our ORBs. Note, that we (the driver and host) only + * initiate the transaction. The SBP-2 device actually transfers the data + * (by reading from the DMA area we tell it). This means that the SBP-2 + * device decides the actual maximum data it can transfer. We just tell it + * the speed that it needs to use, and the max_rec the host supports, and + * it takes care of the rest. + */ +static int sbp2_max_speed_and_size(struct sbp2_lu *lu) +{ + struct sbp2_fwhost_info *hi = lu->hi; + u8 payload; + + lu->speed_code = hi->host->speed[NODEID_TO_NODE(lu->ne->nodeid)]; + + if (lu->speed_code > sbp2_max_speed) { + lu->speed_code = sbp2_max_speed; + SBP2_INFO("Reducing speed to %s", + hpsb_speedto_str[sbp2_max_speed]); + } + + /* Payload size is the lesser of what our speed supports and what + * our host supports. */ + payload = min(sbp2_speedto_max_payload[lu->speed_code], + (u8) (hi->host->csr.max_rec - 1)); + + /* If physical DMA is off, work around limitation in ohci1394: + * packet size must not exceed PAGE_SIZE */ + if (lu->ne->host->low_addr_space < (1ULL << 32)) + while (SBP2_PAYLOAD_TO_BYTES(payload) + 24 > PAGE_SIZE && + payload) + payload--; + + SBP2_INFO("Node " NODE_BUS_FMT ": Max speed [%s] - Max payload [%u]", + NODE_BUS_ARGS(hi->host, lu->ne->nodeid), + hpsb_speedto_str[lu->speed_code], + SBP2_PAYLOAD_TO_BYTES(payload)); + + lu->max_payload_size = payload; + return 0; +} + +static int sbp2_agent_reset(struct sbp2_lu *lu, int wait) +{ + quadlet_t data; + u64 addr; + int retval; + unsigned long flags; + + /* flush lu->protocol_work */ + if (wait) + flush_scheduled_work(); + + data = ntohl(SBP2_AGENT_RESET_DATA); + addr = lu->command_block_agent_addr + SBP2_AGENT_RESET_OFFSET; + + if (wait) + retval = hpsb_node_write(lu->ne, addr, &data, 4); + else + retval = sbp2util_node_write_no_wait(lu->ne, addr, &data, 4); + + if (retval < 0) { + SBP2_ERR("hpsb_node_write failed.\n"); + return -EIO; + } + + /* make sure that the ORB_POINTER is written on next command */ + spin_lock_irqsave(&lu->cmd_orb_lock, flags); + lu->last_orb = NULL; + spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); + + return 0; +} + +static int sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb, + struct sbp2_fwhost_info *hi, + struct sbp2_command_info *cmd, + unsigned int sg_count, + struct scatterlist *sg, + u32 orb_direction, + enum dma_data_direction dma_dir) +{ + struct device *dmadev = hi->host->device.parent; + struct sbp2_unrestricted_page_table *pt; + int i, n; + + n = dma_map_sg(dmadev, sg, sg_count, dma_dir); + if (n == 0) + return -ENOMEM; + + orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id); + orb->misc |= ORB_SET_DIRECTION(orb_direction); + + /* special case if only one element (and less than 64KB in size) */ + if (n == 1) { + orb->misc |= ORB_SET_DATA_SIZE(sg_dma_len(sg)); + orb->data_descriptor_lo = sg_dma_address(sg); + } else { + pt = &cmd->scatter_gather_element[0]; + + dma_sync_single_for_cpu(dmadev, cmd->sge_dma, + sizeof(cmd->scatter_gather_element), + DMA_TO_DEVICE); + + for_each_sg(sg, sg, n, i) { + pt[i].high = cpu_to_be32(sg_dma_len(sg) << 16); + pt[i].low = cpu_to_be32(sg_dma_address(sg)); + } + + orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1) | + ORB_SET_DATA_SIZE(n); + orb->data_descriptor_lo = cmd->sge_dma; + + dma_sync_single_for_device(dmadev, cmd->sge_dma, + sizeof(cmd->scatter_gather_element), + DMA_TO_DEVICE); + } + return 0; +} + +static int sbp2_create_command_orb(struct sbp2_lu *lu, + struct sbp2_command_info *cmd, + struct scsi_cmnd *SCpnt) +{ + struct device *dmadev = lu->hi->host->device.parent; + struct sbp2_command_orb *orb = &cmd->command_orb; + unsigned int scsi_request_bufflen = scsi_bufflen(SCpnt); + enum dma_data_direction dma_dir = SCpnt->sc_data_direction; + u32 orb_direction; + int ret; + + dma_sync_single_for_cpu(dmadev, cmd->command_orb_dma, + sizeof(struct sbp2_command_orb), DMA_TO_DEVICE); + /* + * Set-up our command ORB. + * + * NOTE: We're doing unrestricted page tables (s/g), as this is + * best performance (at least with the devices I have). This means + * that data_size becomes the number of s/g elements, and + * page_size should be zero (for unrestricted). + */ + orb->next_ORB_hi = ORB_SET_NULL_PTR(1); + orb->next_ORB_lo = 0x0; + orb->misc = ORB_SET_MAX_PAYLOAD(lu->max_payload_size); + orb->misc |= ORB_SET_SPEED(lu->speed_code); + orb->misc |= ORB_SET_NOTIFY(1); + + if (dma_dir == DMA_NONE) + orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER; + else if (dma_dir == DMA_TO_DEVICE && scsi_request_bufflen) + orb_direction = ORB_DIRECTION_WRITE_TO_MEDIA; + else if (dma_dir == DMA_FROM_DEVICE && scsi_request_bufflen) + orb_direction = ORB_DIRECTION_READ_FROM_MEDIA; + else { + SBP2_INFO("Falling back to DMA_NONE"); + orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER; + } + + /* set up our page table stuff */ + if (orb_direction == ORB_DIRECTION_NO_DATA_TRANSFER) { + orb->data_descriptor_hi = 0x0; + orb->data_descriptor_lo = 0x0; + orb->misc |= ORB_SET_DIRECTION(1); + ret = 0; + } else { + ret = sbp2_prep_command_orb_sg(orb, lu->hi, cmd, + scsi_sg_count(SCpnt), + scsi_sglist(SCpnt), + orb_direction, dma_dir); + } + sbp2util_cpu_to_be32_buffer(orb, sizeof(*orb)); + + memset(orb->cdb, 0, sizeof(orb->cdb)); + memcpy(orb->cdb, SCpnt->cmnd, SCpnt->cmd_len); + + dma_sync_single_for_device(dmadev, cmd->command_orb_dma, + sizeof(struct sbp2_command_orb), DMA_TO_DEVICE); + return ret; +} + +static void sbp2_link_orb_command(struct sbp2_lu *lu, + struct sbp2_command_info *cmd) +{ + struct sbp2_fwhost_info *hi = lu->hi; + struct sbp2_command_orb *last_orb; + dma_addr_t last_orb_dma; + u64 addr = lu->command_block_agent_addr; + quadlet_t data[2]; + size_t length; + unsigned long flags; + + /* check to see if there are any previous orbs to use */ + spin_lock_irqsave(&lu->cmd_orb_lock, flags); + last_orb = lu->last_orb; + last_orb_dma = lu->last_orb_dma; + if (!last_orb) { + /* + * last_orb == NULL means: We know that the target's fetch agent + * is not active right now. + */ + addr += SBP2_ORB_POINTER_OFFSET; + data[0] = ORB_SET_NODE_ID(hi->host->node_id); + data[1] = cmd->command_orb_dma; + sbp2util_cpu_to_be32_buffer(data, 8); + length = 8; + } else { + /* + * last_orb != NULL means: We know that the target's fetch agent + * is (very probably) not dead or in reset state right now. + * We have an ORB already sent that we can append a new one to. + * The target's fetch agent may or may not have read this + * previous ORB yet. + */ + dma_sync_single_for_cpu(hi->host->device.parent, last_orb_dma, + sizeof(struct sbp2_command_orb), + DMA_TO_DEVICE); + last_orb->next_ORB_lo = cpu_to_be32(cmd->command_orb_dma); + wmb(); + /* Tells hardware that this pointer is valid */ + last_orb->next_ORB_hi = 0; + dma_sync_single_for_device(hi->host->device.parent, + last_orb_dma, + sizeof(struct sbp2_command_orb), + DMA_TO_DEVICE); + addr += SBP2_DOORBELL_OFFSET; + data[0] = 0; + length = 4; + } + lu->last_orb = &cmd->command_orb; + lu->last_orb_dma = cmd->command_orb_dma; + spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); + + if (sbp2util_node_write_no_wait(lu->ne, addr, data, length)) { + /* + * sbp2util_node_write_no_wait failed. We certainly ran out + * of transaction labels, perhaps just because there were no + * context switches which gave khpsbpkt a chance to collect + * free tlabels. Try again in non-atomic context. If necessary, + * the workqueue job will sleep to guaranteedly get a tlabel. + * We do not accept new commands until the job is over. + */ + scsi_block_requests(lu->shost); + PREPARE_WORK(&lu->protocol_work, + last_orb ? sbp2util_write_doorbell: + sbp2util_write_orb_pointer); + schedule_work(&lu->protocol_work); + } +} + +static int sbp2_send_command(struct sbp2_lu *lu, struct scsi_cmnd *SCpnt, + void (*done)(struct scsi_cmnd *)) +{ + struct sbp2_command_info *cmd; + + cmd = sbp2util_allocate_command_orb(lu, SCpnt, done); + if (!cmd) + return -EIO; + + if (sbp2_create_command_orb(lu, cmd, SCpnt)) + return -ENOMEM; + + sbp2_link_orb_command(lu, cmd); + return 0; +} + +/* + * Translates SBP-2 status into SCSI sense data for check conditions + */ +static unsigned int sbp2_status_to_sense_data(unchar *sbp2_status, + unchar *sense_data) +{ + /* OK, it's pretty ugly... ;-) */ + sense_data[0] = 0x70; + sense_data[1] = 0x0; + sense_data[2] = sbp2_status[9]; + sense_data[3] = sbp2_status[12]; + sense_data[4] = sbp2_status[13]; + sense_data[5] = sbp2_status[14]; + sense_data[6] = sbp2_status[15]; + sense_data[7] = 10; + sense_data[8] = sbp2_status[16]; + sense_data[9] = sbp2_status[17]; + sense_data[10] = sbp2_status[18]; + sense_data[11] = sbp2_status[19]; + sense_data[12] = sbp2_status[10]; + sense_data[13] = sbp2_status[11]; + sense_data[14] = sbp2_status[20]; + sense_data[15] = sbp2_status[21]; + + return sbp2_status[8] & 0x3f; +} + +static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, + int destid, quadlet_t *data, u64 addr, + size_t length, u16 fl) +{ + struct sbp2_fwhost_info *hi; + struct sbp2_lu *lu = NULL, *lu_tmp; + struct scsi_cmnd *SCpnt = NULL; + struct sbp2_status_block *sb; + u32 scsi_status = SBP2_SCSI_STATUS_GOOD; + struct sbp2_command_info *cmd; + unsigned long flags; + + if (unlikely(length < 8 || length > sizeof(struct sbp2_status_block))) { + SBP2_ERR("Wrong size of status block"); + return RCODE_ADDRESS_ERROR; + } + if (unlikely(!host)) { + SBP2_ERR("host is NULL - this is bad!"); + return RCODE_ADDRESS_ERROR; + } + hi = hpsb_get_hostinfo(&sbp2_highlevel, host); + if (unlikely(!hi)) { + SBP2_ERR("host info is NULL - this is bad!"); + return RCODE_ADDRESS_ERROR; + } + + /* Find the unit which wrote the status. */ + read_lock_irqsave(&sbp2_hi_logical_units_lock, flags); + list_for_each_entry(lu_tmp, &hi->logical_units, lu_list) { + if (lu_tmp->ne->nodeid == nodeid && + lu_tmp->status_fifo_addr == addr) { + lu = lu_tmp; + break; + } + } + read_unlock_irqrestore(&sbp2_hi_logical_units_lock, flags); + + if (unlikely(!lu)) { + SBP2_ERR("lu is NULL - device is gone?"); + return RCODE_ADDRESS_ERROR; + } + + /* Put response into lu status fifo buffer. The first two bytes + * come in big endian bit order. Often the target writes only a + * truncated status block, minimally the first two quadlets. The rest + * is implied to be zeros. */ + sb = &lu->status_block; + memset(sb->command_set_dependent, 0, sizeof(sb->command_set_dependent)); + memcpy(sb, data, length); + sbp2util_be32_to_cpu_buffer(sb, 8); + + /* Ignore unsolicited status. Handle command ORB status. */ + if (unlikely(STATUS_GET_SRC(sb->ORB_offset_hi_misc) == 2)) + cmd = NULL; + else + cmd = sbp2util_find_command_for_orb(lu, sb->ORB_offset_lo); + if (cmd) { + /* Grab SCSI command pointers and check status. */ + /* + * FIXME: If the src field in the status is 1, the ORB DMA must + * not be reused until status for a subsequent ORB is received. + */ + SCpnt = cmd->Current_SCpnt; + spin_lock_irqsave(&lu->cmd_orb_lock, flags); + sbp2util_mark_command_completed(lu, cmd); + spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); + + if (SCpnt) { + u32 h = sb->ORB_offset_hi_misc; + u32 r = STATUS_GET_RESP(h); + + if (r != RESP_STATUS_REQUEST_COMPLETE) { + SBP2_INFO("resp 0x%x, sbp_status 0x%x", + r, STATUS_GET_SBP_STATUS(h)); + scsi_status = + r == RESP_STATUS_TRANSPORT_FAILURE ? + SBP2_SCSI_STATUS_BUSY : + SBP2_SCSI_STATUS_COMMAND_TERMINATED; + } + + if (STATUS_GET_LEN(h) > 1) + scsi_status = sbp2_status_to_sense_data( + (unchar *)sb, SCpnt->sense_buffer); + + if (STATUS_TEST_DEAD(h)) + sbp2_agent_reset(lu, 0); + } + + /* Check here to see if there are no commands in-use. If there + * are none, we know that the fetch agent left the active state + * _and_ that we did not reactivate it yet. Therefore clear + * last_orb so that next time we write directly to the + * ORB_POINTER register. That way the fetch agent does not need + * to refetch the next_ORB. */ + spin_lock_irqsave(&lu->cmd_orb_lock, flags); + if (list_empty(&lu->cmd_orb_inuse)) + lu->last_orb = NULL; + spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); + + } else { + /* It's probably status after a management request. */ + if ((sb->ORB_offset_lo == lu->reconnect_orb_dma) || + (sb->ORB_offset_lo == lu->login_orb_dma) || + (sb->ORB_offset_lo == lu->query_logins_orb_dma) || + (sb->ORB_offset_lo == lu->logout_orb_dma)) { + lu->access_complete = 1; + wake_up_interruptible(&sbp2_access_wq); + } + } + + if (SCpnt) + sbp2scsi_complete_command(lu, scsi_status, SCpnt, + cmd->Current_done); + return RCODE_COMPLETE; +} + +/************************************** + * SCSI interface related section + **************************************/ + +static int sbp2scsi_queuecommand(struct scsi_cmnd *SCpnt, + void (*done)(struct scsi_cmnd *)) +{ + struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0]; + struct sbp2_fwhost_info *hi; + int result = DID_NO_CONNECT << 16; + + if (unlikely(!sbp2util_node_is_available(lu))) + goto done; + + hi = lu->hi; + + if (unlikely(!hi)) { + SBP2_ERR("sbp2_fwhost_info is NULL - this is bad!"); + goto done; + } + + /* Multiple units are currently represented to the SCSI core as separate + * targets, not as one target with multiple LUs. Therefore return + * selection time-out to any IO directed at non-zero LUNs. */ + if (unlikely(SCpnt->device->lun)) + goto done; + + if (unlikely(!hpsb_node_entry_valid(lu->ne))) { + SBP2_ERR("Bus reset in progress - rejecting command"); + result = DID_BUS_BUSY << 16; + goto done; + } + + /* Bidirectional commands are not yet implemented, + * and unknown transfer direction not handled. */ + if (unlikely(SCpnt->sc_data_direction == DMA_BIDIRECTIONAL)) { + SBP2_ERR("Cannot handle DMA_BIDIRECTIONAL - rejecting command"); + result = DID_ERROR << 16; + goto done; + } + + if (sbp2_send_command(lu, SCpnt, done)) { + SBP2_ERR("Error sending SCSI command"); + sbp2scsi_complete_command(lu, + SBP2_SCSI_STATUS_SELECTION_TIMEOUT, + SCpnt, done); + } + return 0; + +done: + SCpnt->result = result; + done(SCpnt); + return 0; +} + +static void sbp2scsi_complete_all_commands(struct sbp2_lu *lu, u32 status) +{ + struct list_head *lh; + struct sbp2_command_info *cmd; + unsigned long flags; + + spin_lock_irqsave(&lu->cmd_orb_lock, flags); + while (!list_empty(&lu->cmd_orb_inuse)) { + lh = lu->cmd_orb_inuse.next; + cmd = list_entry(lh, struct sbp2_command_info, list); + sbp2util_mark_command_completed(lu, cmd); + if (cmd->Current_SCpnt) { + cmd->Current_SCpnt->result = status << 16; + cmd->Current_done(cmd->Current_SCpnt); + } + } + spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); + + return; +} + +/* + * Complete a regular SCSI command. Can be called in atomic context. + */ +static void sbp2scsi_complete_command(struct sbp2_lu *lu, u32 scsi_status, + struct scsi_cmnd *SCpnt, + void (*done)(struct scsi_cmnd *)) +{ + if (!SCpnt) { + SBP2_ERR("SCpnt is NULL"); + return; + } + + switch (scsi_status) { + case SBP2_SCSI_STATUS_GOOD: + SCpnt->result = DID_OK << 16; + break; + + case SBP2_SCSI_STATUS_BUSY: + SBP2_ERR("SBP2_SCSI_STATUS_BUSY"); + SCpnt->result = DID_BUS_BUSY << 16; + break; + + case SBP2_SCSI_STATUS_CHECK_CONDITION: + SCpnt->result = CHECK_CONDITION << 1 | DID_OK << 16; + break; + + case SBP2_SCSI_STATUS_SELECTION_TIMEOUT: + SBP2_ERR("SBP2_SCSI_STATUS_SELECTION_TIMEOUT"); + SCpnt->result = DID_NO_CONNECT << 16; + scsi_print_command(SCpnt); + break; + + case SBP2_SCSI_STATUS_CONDITION_MET: + case SBP2_SCSI_STATUS_RESERVATION_CONFLICT: + case SBP2_SCSI_STATUS_COMMAND_TERMINATED: + SBP2_ERR("Bad SCSI status = %x", scsi_status); + SCpnt->result = DID_ERROR << 16; + scsi_print_command(SCpnt); + break; + + default: + SBP2_ERR("Unsupported SCSI status = %x", scsi_status); + SCpnt->result = DID_ERROR << 16; + } + + /* If a bus reset is in progress and there was an error, complete + * the command as busy so that it will get retried. */ + if (!hpsb_node_entry_valid(lu->ne) + && (scsi_status != SBP2_SCSI_STATUS_GOOD)) { + SBP2_ERR("Completing command with busy (bus reset)"); + SCpnt->result = DID_BUS_BUSY << 16; + } + + /* Tell the SCSI stack that we're done with this command. */ + done(SCpnt); +} + +static int sbp2scsi_slave_alloc(struct scsi_device *sdev) +{ + struct sbp2_lu *lu = (struct sbp2_lu *)sdev->host->hostdata[0]; + + if (sdev->lun != 0 || sdev->id != lu->ud->id || sdev->channel != 0) + return -ENODEV; + + lu->sdev = sdev; + sdev->allow_restart = 1; + + /* SBP-2 requires quadlet alignment of the data buffers. */ + blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1); + + if (lu->workarounds & SBP2_WORKAROUND_INQUIRY_36) + sdev->inquiry_len = 36; + return 0; +} + +static int sbp2scsi_slave_configure(struct scsi_device *sdev) +{ + struct sbp2_lu *lu = (struct sbp2_lu *)sdev->host->hostdata[0]; + + sdev->use_10_for_rw = 1; + + if (sbp2_exclusive_login) + sdev->manage_start_stop = 1; + if (sdev->type == TYPE_ROM) + sdev->use_10_for_ms = 1; + if (sdev->type == TYPE_DISK && + lu->workarounds & SBP2_WORKAROUND_MODE_SENSE_8) + sdev->skip_ms_page_8 = 1; + if (lu->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) + sdev->fix_capacity = 1; + if (lu->workarounds & SBP2_WORKAROUND_POWER_CONDITION) + sdev->start_stop_pwr_cond = 1; + if (lu->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS) + blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512); + + blk_queue_max_segment_size(sdev->request_queue, SBP2_MAX_SEG_SIZE); + return 0; +} + +static void sbp2scsi_slave_destroy(struct scsi_device *sdev) +{ + ((struct sbp2_lu *)sdev->host->hostdata[0])->sdev = NULL; + return; +} + +/* + * Called by scsi stack when something has really gone wrong. + * Usually called when a command has timed-out for some reason. + */ +static int sbp2scsi_abort(struct scsi_cmnd *SCpnt) +{ + struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0]; + struct sbp2_command_info *cmd; + unsigned long flags; + + SBP2_INFO("aborting sbp2 command"); + scsi_print_command(SCpnt); + + if (sbp2util_node_is_available(lu)) { + sbp2_agent_reset(lu, 1); + + /* Return a matching command structure to the free pool. */ + spin_lock_irqsave(&lu->cmd_orb_lock, flags); + cmd = sbp2util_find_command_for_SCpnt(lu, SCpnt); + if (cmd) { + sbp2util_mark_command_completed(lu, cmd); + if (cmd->Current_SCpnt) { + cmd->Current_SCpnt->result = DID_ABORT << 16; + cmd->Current_done(cmd->Current_SCpnt); + } + } + spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); + + sbp2scsi_complete_all_commands(lu, DID_BUS_BUSY); + } + + return SUCCESS; +} + +/* + * Called by scsi stack when something has really gone wrong. + */ +static int sbp2scsi_reset(struct scsi_cmnd *SCpnt) +{ + struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0]; + + SBP2_INFO("reset requested"); + + if (sbp2util_node_is_available(lu)) { + SBP2_INFO("generating sbp2 fetch agent reset"); + sbp2_agent_reset(lu, 1); + } + + return SUCCESS; +} + +static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev; + struct sbp2_lu *lu; + + if (!(sdev = to_scsi_device(dev))) + return 0; + + if (!(lu = (struct sbp2_lu *)sdev->host->hostdata[0])) + return 0; + + if (sbp2_long_sysfs_ieee1394_id) + return sprintf(buf, "%016Lx:%06x:%04x\n", + (unsigned long long)lu->ne->guid, + lu->ud->directory_id, ORB_SET_LUN(lu->lun)); + else + return sprintf(buf, "%016Lx:%d:%d\n", + (unsigned long long)lu->ne->guid, + lu->ud->id, ORB_SET_LUN(lu->lun)); +} + +MODULE_AUTHOR("Ben Collins <bcollins@debian.org>"); +MODULE_DESCRIPTION("IEEE-1394 SBP-2 protocol driver"); +MODULE_SUPPORTED_DEVICE(SBP2_DEVICE_NAME); +MODULE_LICENSE("GPL"); + +static int sbp2_module_init(void) +{ + int ret; + + if (sbp2_serialize_io) { + sbp2_shost_template.can_queue = 1; + sbp2_shost_template.cmd_per_lun = 1; + } + + sbp2_shost_template.max_sectors = sbp2_max_sectors; + + hpsb_register_highlevel(&sbp2_highlevel); + ret = hpsb_register_protocol(&sbp2_driver); + if (ret) { + SBP2_ERR("Failed to register protocol"); + hpsb_unregister_highlevel(&sbp2_highlevel); + return ret; + } + return 0; +} + +static void __exit sbp2_module_exit(void) +{ + hpsb_unregister_protocol(&sbp2_driver); + hpsb_unregister_highlevel(&sbp2_highlevel); +} + +module_init(sbp2_module_init); +module_exit(sbp2_module_exit); |
